Added framework xml documentation for all "exploration" events.

ObservatoryFramework/Files/Journal/Exploration/SellExplorationData.cs

@@ -2,12 +2,30 @@
 
 namespace Observatory.Framework.Files.Journal
 {
+    /// <summary>
+    /// Event generated when selling exploration data. Historically also written for multi-selling, but used only for single system sales in current live game client.
+    /// </summary>
     public class SellExplorationData : JournalBase
     {
+        /// <summary>
+        /// List of systems for which data was sold.
+        /// </summary>
         public ImmutableList<string> Systems { get; init; }
+        /// <summary>
+        /// List of first discovered bodies.
+        /// </summary>
         public ImmutableList<string> Discovered { get; init; }
+        /// <summary>
+        /// Base value of sold data.
+        /// </summary>
         public long BaseValue { get; init; }
+        /// <summary>
+        /// Extra amount from bonuses.
+        /// </summary>
         public long Bonus { get; init; }
+        /// <summary>
+        /// Total amount made from selling data.
+        /// </summary>
         public long TotalEarnings { get; init; }
     }
 }